Adrian Gonzalez felt fine when he worked out with the Red Sox on Thursday night at Tropicana Field. A routine trip to the mall on Friday changed that.

Gonzalez was getting a cup of coffee at the International Plaza in Tampa when he bent over to say hello to a child in a stroller. That's when he felt his lower back lock up.

"I have no idea how it happened," said Gonzalez, who has never had back problems before. "It was something I've done a million times."

Gonzalez tried to play on Friday night, but was scratched from the lineup an hour before first pitch. He was out again on Saturday night, the Red Sox starting Brett Lillibridge at first base against the Rays.